Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cac bac » cac bai, cac ban, cac cach
bac may » ban may, bach mai, bac thay
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
bi van » bui van, binh van
x hoi » xa hoi, o hoi, x ho
bi va » bo va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang x hoi. hieu ve cac bac may tinh ((bi va) or (((bi van) or (vi van)))) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ve cac bac may tinh ((bi va) OR (((bi van) OR (vi van)))) thiet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ve cac bac may tinh ((bi va) or (((bi van) or (vi van)))) thiet*.